Fix some broken anchor links (nushell#1548)

Author: sgvictorino

blog/2023-01-10-nushell_0_74.md

@@ -229,14 +229,14 @@ We are exploring how nushell can leverage that for more useful diagnostics and c
 
 - [Nushell 0.74](#nushell-074)
 - [Where to get it](#where-to-get-it)
-- [Themes of this release / New features](#themes-of-this-release--new-features)
+- [Themes of this release / New features](#themes-of-this-release-new-features)
   - [Known externals commands and `exec` now have "fall-through" signatures (merelymyself, WindSoilder, kubouch)](#known-externals-commands-and-exec-now-have-fall-through-signatures-merelymyself-windsoilder-kubouch)
   - [`help` is now more helpful (kubouch)](#help-is-now-more-helpful-kubouch)
   - [Initial support for parse-time constants (kubouch)](#initial-support-for-parse-time-constants-kubouch)
   - [New `url encode` command to percent-encode URLs (MehulG)](#new-url-encode-command-to-percent-encode-urls-mehulg)
   - [`values` command to programmatically interact with records (webbedspace)](#values-command-to-programmatically-interact-with-records-webbedspace)
   - [`get`, `select`, cell path access on tables will now error when encountering a hole (kubouch, webbedspace)](#get-select-cell-path-access-on-tables-will-now-error-when-encountering-a-hole-kubouch-webbedspace)
-  - [Behavior of `-i`/`--ignore-errors` flag for `get` and `select` when the entire column is absent has changed](#behavior-of--i--ignore-errors-flag-for-get-and-select-when-the-entire-column-is-absent-has-changed)
+  - [Behavior of `-i`/`--ignore-errors` flag for `get` and `select` when the entire column is absent has changed](#behavior-of-i-ignore-errors-flag-for-get-and-select-when-the-entire-column-is-absent-has-changed)
   - [Certain misused punctuation in `def` definitions are now errors (webbedspace, webbedspace)](#certain-misused-punctuation-in-def-definitions-are-now-errors-webbedspace-webbedspace)
   - [`$in` now works in `catch` closures](#in-now-works-in-catch-closures)
   - [MIME-types are supported in `ls` with an additional flag. (fdncred)](#mime-types-are-supported-in-ls-with-an-additional-flag-fdncred)

blog/2024-01-09-nushell_0_89_0.md

@@ -31,11 +31,11 @@ As part of this release, we also publish a set of optional plugins you can insta
 - [Nushell 0.89.0](#nushell-0890)
 - [Where to get it](#where-to-get-it)
 - [Table of content](#table-of-content)
-- [Themes of this release / New features \[toc\]](#themes-of-this-release--new-features-toc)
-  - [Removal of directory module auto-exports](#update-19012024-breaking-change-removal-of-directory-module-auto-exports-toc)
+- [Themes of this release / New features \[toc\]](#themes-of-this-release-new-features-toc)
+  - [Removal of directory module auto-exports](#update-19-01-2024-breaking-change-removal-of-directory-module-auto-exports-toc)
   - [Spread operator for commands](#spread-operator-for-commands)
   - [Editor Improvements](#editor-improvements)
-  - [Deprecation of `--flag: bool`](#deprecation-of---flag-bool)
+  - [Deprecation of `--flag: bool`](#deprecation-of-flag-bool)
   - [Our set of commands is evolving \[toc\]](#our-set-of-commands-is-evolving-toc)
     - [New commands \[toc\]](#new-commands-toc)
       - [`ulimit` for Unix-based systems](#ulimit-for-unix-based-systems)

blog/2024-02-06-nushell_0_90_0.md

@@ -31,14 +31,14 @@ As part of this release, we also publish a set of optional plugins you can insta
 - [Nushell 0.90.1](#nushell-0901)
 - [Where to get it](#where-to-get-it)
 - [Table of content](#table-of-content)
-- [Themes of this release / New features \[toc\]](#themes-of-this-release--new-features-toc)
+- [Themes of this release / New features \[toc\]](#themes-of-this-release-new-features-toc)
   - [New Reedline coolness](#new-reedline-coolness)
   - [(Breaking Change!) Handling globs](#breaking-change-handling-globs)
   - [Starting a new Language Reference](#starting-a-new-language-reference)
   - [Parse-time evaluation](#parse-time-evaluation)
   - [Integration of more uutils commands](#integration-of-more-uutils-commands)
   - [Dataframes: allow specifying schema (#11634)](#dataframes-allow-specifying-schema-11634)
-  - [New CLI flag: `--no-history` (#11550)](#new-cli-flag---no-history-11550)
+  - [New CLI flag: `--no-history` (#11550)](#new-cli-flag-no-history-11550)
   - [Strict JSON parsing (#11592)](#strict-json-parsing-11592)
   - [Our set of commands is evolving \[toc\]](#our-set-of-commands-is-evolving-toc)
     - [New commands \[toc\]](#new-commands-toc)

book/navigating_structured_data.md

@@ -16,7 +16,7 @@ Given Nushell's strong support for structured data, some of the more common task
 - [Using `get` and `select`](#using-get-and-select)
   - Example - `get` vs. `select` with a Table Row
   - Example - `select` with multiple rows and columns
-- [Handling missing data using the optional operator](#handling-missing-data---the-optional-operator)
+- [Handling missing data using the optional operator](#the-optional-operator)
 - [Key/Column names with spaces](#keycolumn-names-with-spaces)
 - [Other commands for navigating structured data](#other-commands-for-accessing-structured-data)